These vacuum pump oil cap exhaust pressure gauge replacements are totally compatible with Busch Pumps and are used to monitor the differential pressure across the oil filters. An increase in differential pressure signals that it is time to replace the oil filter element in your vacuum pump. Other parts for Busch Pumps are sold on this web site.

Fits Models: RA, RB, and RC
Fits Pump Sizes: 0010, 0012, 0016, 0025, 0040, 0063, 0100, 0160, 0250, 040 1000, 1600